相对于未受过训练的男性和女性受试者在骑行时的活动肌肉质量所表达的最大累积氧亏。
Maximal accumulated oxygen deficit expressed relative to the active muscle mass for cycling in untrained male and female subjects.
作者信息
Weber C L, Schneider D A
机构信息
School of Physiotherapy and Exercise Science, Griffith University, Gold Coast, Queensland, Australia.
出版信息
Eur J Appl Physiol. 2000 Jul;82(4):255-61. doi: 10.1007/s004210000214.
The purpose of the present study was to determine if gender differences exist in the maximal accumulated oxygen deficit (MAOD) or in the blood lactate (Lac-) and catecholamine responses to the MAOD test (120% peak oxygen uptake to exhaustion). The MAOD for cycling was measured in ten untrained male and ten untrained female subjects using the method described by Medbø et al. (Anaerobic capacity determined by maximal accumulated oxygen deficit. J Appl Physiol 64: 50-60, 1988). Blood Lac- and catecholamine concentrations were measured at rest, exhaustion and for 30 min following the MAOD test. Dual-energy X-ray absorptiometry was used to measure lean body mass (LBM) and to estimate the active muscle mass (AMM) for cycling. Males achieved a significantly higher MAOD than females following correction for AMM [126.3 (5.6) versus 108.3 (6.1) ml x kg AMM(-1), P = 0.04]. The peak blood lactate concentration ([Lac-]) in males [13.6 (0.9) mmol x l(-1)] was significantly higher than in females [10.0 (1.0) mmol x l(-1)]. Males obtained a 68% higher peak epinephrine concentration ([Epi]) than females, but the difference was not significant [1268 (188) pg x ml(-1) versus 755 (179) pg x ml(-1), P = 0.066]. However, plasma [Epi] was significantly higher for males than females at 1 min [824 (116) versus 489 (116) pg x ml(-1), P = 0.036] and 3 min [330 (52) versus 179 (42) pg x ml(-1), P = 0.039] into the recovery period. No gender-dependent differences in the norepinephrine concentration were observed at any time. Peak [Lac-] was significantly correlated with MAOD (ml x kg AMM(-1)) in females (r = 0.75), but not in males (r = 0.09). The peak plasma [Epi] was not significantly correlated with MAOD (ml x kg AMM(-1)) or peak [Lac-] in either group. These findings suggest that there are gender-dependent differences in MAOD even when expressed relative to the AMM for cycling. The higher blood [Lac-] in males compared to females obtained after supramaximal exercise was not caused by enhanced secretion of Epi. The greater MAOD in untrained males was not caused by a greater ability to produce Lac- or by enhanced secretion of Epi.
本研究的目的是确定在最大累积氧亏（MAOD）方面，或者在对MAOD测试（120%峰值摄氧量直至力竭）的血乳酸（Lac-）和儿茶酚胺反应方面是否存在性别差异。采用Medbø等人（通过最大累积氧亏测定无氧能力。《应用生理学杂志》64: 50 - 60, 1988）描述的方法，对10名未经训练的男性和10名未经训练的女性受试者进行了骑行MAOD的测量。在静息、力竭时以及MAOD测试后30分钟测量血Lac-和儿茶酚胺浓度。使用双能X射线吸收法测量去脂体重（LBM）并估算骑行的活跃肌肉质量（AMM）。在校正AMM后，男性的MAOD显著高于女性[126.3（5.6）对108.3（6.1）ml×kg AMM⁻¹，P = 0.04]。男性的血乳酸峰值浓度（[Lac-]）[13.6（0.9）mmol×l⁻¹]显著高于女性[10.0（1.0）mmol×l⁻¹]。男性的肾上腺素峰值浓度（[Epi]）比女性高68%，但差异不显著[1268（188）pg×ml⁻¹对755（179）pg×ml⁻¹，P = 0.066]。然而，在恢复期1分钟时男性的血浆[Epi]显著高于女性[824（116）对489（116）pg×ml⁻¹，P = 0.036]，3分钟时也是如此[330（52）对179（42）pg×ml⁻¹，P = 0.039]。在任何时间均未观察到去甲肾上腺素浓度存在性别依赖性差异。女性的峰值[Lac-]与MAOD（ml×kg AMM⁻¹）显著相关（r = 0.75），而男性则不然（r = 0.09）。两组中峰值血浆[Epi]与MAOD（ml×kg AMM⁻¹）或峰值[Lac-]均无显著相关性。这些发现表明，即使相对于骑行的AMM来表示，MAOD也存在性别依赖性差异。男性在超最大运动后血[Lac-]高于女性并非由Epi分泌增加所致。未经训练男性的MAOD较高并非由于产生Lac-的能力更强或Epi分泌增加。
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